25065698640 has 40 divisors (see below), whose sum is σ = 77703666528. Its totient is φ = 6684186240.

The previous prime is 25065698629. The next prime is 25065698659. The reversal of 25065698640 is 4689656052.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×25065698640² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52219966 + ... + 52220445.

Almost surely, 2^25065698640 is an apocalyptic number.

25065698640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25065698640 is an abundant number, since it is smaller than the sum of its proper divisors (52637967888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25065698640 is a wasteful number, since it uses less digits than its factorization.

25065698640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104440427 (or 104440421 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 25065698640 in words is "twenty-five billion, sixty-five million, six hundred ninety-eight thousand, six hundred forty".